Agree with Jim Hendricks. Also, go to a leather store where they sell horse saddles and buy some saddle soap. I use the saddle soap on anything leather and it works great. Don't use alcohol or you will completely dry out the leather and it will begin to crack.
You could also go to an auto parts store and buy Lexol leather cleaner and Lexol Conditioner.
Head Stringer @ the LTC, Babolat Star 4 Stringer